If you didn't want the job, would you have still posted asking us?

I think it sounds like a fantastic opportunity, perhaps see if the grant allows part time employment or deferring a few months? I can't speak to the strength of your relationship, but I would expect five months to be doable for most, and you would always be able to video chat at an AirBnB, no?

Go for it, it sounds like one hell of an experience.